I should add, if there is any build up in the radiator or heater core due from neglect or not servicing, the stuff you pour in to stop a leak is designed to "stop a leak" The heater & radiator cores are small as it is.

Those so called sealers were designed for for big rigs with massive
cooling systems, they were never intended for small vehicles as it
tends to plug everything up, radiators, heater cores, small cooling
passages inside the engine, that stuff really mucks things up when
you try to do the repairs later on. Never add anything like that to
your vehicle.

Never used the blue devil stop leak
before but have used Alumaseal
and bars leak with no problems
matter of fact it's been almost two
years now and no leaks and no
problems. If you do use a stop leak
and it does not work do not
continue to add more hoping it will
work that is when you can clog up
the cooling system.

Blue Devil does work BUT you must follow the
instructions EXACTLY as they're printed on the
bottle! One of our customers uses it from time
to time and we've never had any complaints
about it. I work for NAPA. HTH. -Jim

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